Basic knowledge of circuit board maintenance and maintenance

Circuit board maintenance is a hot repair industry. Industrial equipment in recent years more and more high degree of automation, so the number of industrial control board in a wide range of industries is also more and more, industrial control board after damage, the higher cost of the replacement of circuit board needed to also become each enterprise is very headache thing. In fact, the majority of these damaged circuit boards can be repaired at home, and the cost is only 20 percent of the purchase of a new board -- 30 percent, and the time spent is much shorter than that of the foreign board. Basic knowledge of circuit board maintenance is described below.

Almost all of the circuit board maintenance without drawing materials, so a lot of people are skeptical of circuit board maintenance, although all kinds of circuit boards differ in thousands ways, but the same is each circuit board is composed of integrated blocks, resistor, capacitor and other components, so the damage of circuit board must be the result of a damaged one or several components, circuit board maintenance is established based on the above factors. Circuit board maintenance is divided into two parts: detection and maintenance, where detection occupies an important position. The basic knowledge of each device on the circuit board is tested until the broken parts are found and replaced, then the circuit board is fixed.

Circuit board detection is the process of finding, identifying and correcting every electronic component fault on the circuit board. Actually the whole detection process is the process of thinking process and provides a logical reasoning test, so the test engineer must be in the process of circuit board maintenance, testing and maintenance, gradually accumulate experience, and constantly improve the level. General electronic equipment is composed of tens of thousands of components, when maintenance, repair, if by directly one by one each of test circuit board components would be very time consuming to find the word of the problem, is also very difficult. Therefore, it is an important method to overhaul the system from fault to fault. As long as the circuit board detects the problem, the repair is easy. This is the basic knowledge of circuit board maintenance.

The circuit board should be maintained regularly during use to ensure the circuit board is in good condition and reduce the failure rate of the circuit board. The maintenance of the circuit board in use is as follows:

1. Semi-annual maintenance:

(1) observe the electronic components in the circuit without the trace of high temperature. The electrolytic capacitor has no leakage phenomenon and should be replaced.

(2) clean up the dust on the circuit board every quarter, clean the circuit board special cleaning fluid, and then blow the circuit board with the blower after cleaning the circuit board.

2. Annual maintenance:

(1) clean up the dust on the circuit board.

(2) for high power devices with cooling silicon grease, should check the cooling is there dry solid silicon grease, for dry solid dry solid heat dissipation silicon grease should be cleared after coated with new heat dissipation silicon grease, in order to prevent the circuit board burn out due to bad heat dissipation of high power device.

(3) to sampling observation of electrolytic capacitor capacity of circuit boards, such as found electrolytic capacitor has a capacity of less than 20% of the nominal capacity, should be replaced, usually the life of the electrolytic capacitor is ten years or so, it must be all be replaced, in order to ensure the performance of circuit board.